This excerpt taken from the PCG 10-K filed Feb 18, 2005.
5.2.1 System Requirements. The ISO shall establish reasonable metering, monitoring, and data collection standards and requirements for the ISO Controlled Grid, consistent with WSCC and NERC standards.
5.2.2 System Conditions. The ISO shall monitor and observe real time system conditions throughout the ISO Controlled Grid, as well as key facilities in other areas of the WSCC region.
5.2.3 Power Management System. The ISO shall install a computerized Power Management System (PMS) to monitor transmission facilities in the ISO Controlled Grid. A Participating TO may at its own expense and for its own internal management purposes install a read only PMS workstation that will provide the Participating TO with the same displays the ISO uses to monitor the Participating TO's transmission facilitates.
5.2.4 Data. Unless otherwise mutually agreed, the ISO shall obtain real time monitoring data for the facilities listed in the ISO Register from the Participating TOs through transfers to the ISO of data available from the Energy Management Systems (EMS) of the Participating TOs.